A TensorFlow machine learning model on Compute Engine virtual machines (n2-standard-32) takes two days to complete training. The model has custom TensorFlow operations that must run partially on a CPU. You want to reduce the training time in a cost-effective manner. What should you do?

A. Change the VM type to n2-highmem-32. B. Change the VM type to e2-standard-32. C. Train the model using a VM with a GPU hardware accelerator. D. Train the model using a VM with a TPU hardware accelerator.